Joe, I would enjoy doing a MaxIm imaging session with you. Perhaps we can talk Patrick into an evening that works for all three of us. The focusing method you refer to is known as a Hartmann Mask, and I think they work pretty well for planetary imaging etc. But for critical focus on a fast newt like my F3.3 Epsilon, some type of software is extremely helpful. IMHO Cheers, Tyler _________________ Joe wrote: <Tyler, I would love to attend a session on maxIm, since I own a copy. <Also, what do you think about a simple focusing aid where three holes in a <cardboard mask are used to make the star images converge? I forget the <name of this device but I made one and it seems to work well. Thanks, Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com